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Method for treating wastewater generated in white carbon black production process by precipitation process

A treatment method and technology of precipitation method, which can be used in sedimentation treatment, filtration treatment, multi-stage water treatment, etc., can solve the problem of insufficient resource utilization of wastewater, and achieve the effect of small footprint, easy hardening prevention, and longevity guarantee.

Inactive Publication Date: 2021-04-09
HANGZHOU BLUETEC ENVIRONMENTAL TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the defect of insufficient recycling of waste water in the prior art, and provide a treatment method for waste water produced in the process of producing white carbon black by precipitation method, which has high recovery efficiency and environmental protection effect

Method used

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  • Method for treating wastewater generated in white carbon black production process by precipitation process

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Embodiment

[0043] S1: The white carbon black wastewater containing sodium sulfate with a mass fraction of 1-5% is treated by plate and frame filter press and then passed into an electrocoagulation system for the first step of pretreatment. Adjust the current density of the electrocoagulation system to 80A / m 2 , power on for a certain period of time to ensure that the silica content of the wastewater in the effluent treated by the electrocoagulation system is lower than 15mg / L.

[0044] Subsequently, the produced water treated by the electrocoagulation system is passed into the radial flow sedimentation tank, and the wastewater is allowed to stay in the radial flow sedimentation tank for 2 hours. After the impurities in the wastewater are completely precipitated, most of the suspended matter in the wastewater is separated. , so as to obtain the produced water and sludge impurities. Sludge impurities enter the plate and frame filter press to recover the silicon in the sludge or directly t...

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Abstract

The invention discloses a method for treating wastewater generated in the process of producing white carbon black by a precipitation process, which comprises the following steps: introducing wastewater into a pretreatment system, and then introducing the wastewater into an ultra-filtration system; introducing effluent into a homogeneous membrane electro-dialysis system to obtain a concentrated water product and a fresh water product; introducing the concentrated water product into a resin treatment device, introducing the effluent into a bipolar membrane electro-dialysis system, and carrying out a reaction to obtain an acid solution, an alkali solution and an unreacted salt solution; introducing the fresh water product into a secondary reverse osmosis treatment system, and using the produced water treated by the secondary reverse osmosis treatment system as production water to realize cyclic utilization. When the method is used in the white carbon black wastewater treatment process, almost no wastewater or waste is discharged in the whole process section, the wastewater is finally recycled in the form of water, acid or alkali, a small amount of solid waste generated in the pre-treatment process can recover silicon or be treated according to common solid waste, and the method is simple, environmentally friendly and good in industrial application prospect.

Description

technical field [0001] The invention belongs to the field of waste water treatment methods, in particular to a treatment method for waste water produced in the process of producing white carbon black by a precipitation process. Background technique [0002] Silica, also known as hydrated silica (SiO 2 ·nH 2 O), which is a white amorphous porous substance, has the advantages of fine particles, large specific surface area, and porosity, and is widely used in the reinforcement and modification of the rubber industry. At present, the traditional white carbon black production methods are divided into precipitation method and gas phase method. The precipitation method has the advantages of simple equipment, small investment and low cost, so it is adopted by most white carbon black manufacturers in my country. [0003] The domestic mainstream sulfuric acid precipitation method uses sulfuric acid to acidify water glass to form silicic acid, which is then separated to obtain precip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/34C02F101/20
CPCC02F9/00C02F2103/34C02F1/001C02F1/444C02F1/4693C02F1/42C02F2101/20C02F1/441C02F2301/08C02F1/463C02F2001/007Y02A20/131
Inventor 张笑维李想于赵弟钱浩冲岳军
Owner HANGZHOU BLUETEC ENVIRONMENTAL TECH
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